package com.sykj.why.util;

import freemarker.template.Configuration;
import freemarker.template.Template;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.Map;

public class exportWord {

    private exportWord() {
        throw new AssertionError();
    }

    //配置信息,代码本身写的还是很可读的,就不过多注解了
    private static Configuration configuration = null;
    //这里注意的是利用WordUtils的类加载器动态获得模板文件的位置
    private static final String templateFolder =  exportWord.class.getClassLoader().getResource("exportTemplates").getPath();  //"D:/patrol";//
    //private static final String templateFolder = "H:/我的项目/lm/lm/web/src/main/webapp/WEB-INF/templates";
    static {
        configuration = new Configuration();
        configuration.setDefaultEncoding("utf-8");
        try {
            configuration.setDirectoryForTemplateLoading(new File(templateFolder));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 非遗项目导出
     * @param request
     * @param response
     * @param map
     * @param title
     * @param ftlFile
     * @param fileUrl
     * @throws IOException
     */
    public static void exportMillCertificateWord(HttpServletRequest request,
            HttpServletResponse response, Map map, String title,
            String ftlFile, String fileUrl) throws IOException {
        Template freemarkerTemplate = configuration.getTemplate(ftlFile);
        File file = null;
        InputStream fin = null;
        //ServletOutputStream out = null;
        FileOutputStream out = null;
        try {
            // 调用工具类的createDoc方法生成Word文档
            file = createDoc(map,freemarkerTemplate);
            fin = new FileInputStream(file);
            String fileName = title + ".doc";
			/*response.setCharacterEncoding("utf-8");
			response.setContentType("application/msword");
			// 设置浏览器以下载的方式处理该文件名
			String fileName = title + ".doc";
			response.setHeader("Content-Disposition", "attachment;filename="
					.concat(String.valueOf(URLEncoder.encode(fileName, "UTF-8"))));

			out = response.getOutputStream(); */
            File file2 = new File(fileUrl+fileName);
            if (!file2.exists()) {
                file2.createNewFile();
            }
            out = new FileOutputStream(file2);
            byte[] buffer = new byte[512];  // 缓冲区
            int bytesToRead = -1;
            // 通过循环将读入的Word文件的内容输出到浏览器中
            while((bytesToRead = fin.read(buffer)) != -1) {
                out.write(buffer, 0, bytesToRead);
            }
        } finally {
            if(fin != null) fin.close();
            if(out != null) out.close();
            if(file != null) file.delete(); // 删除临时文件
        }
    }

    private static File createDoc(Map<?, ?> dataMap, Template template) {
        String name =  "sellPlan.doc";
        File f = new File(name);
        Template t = template;
        try {
            // 这个地方不能使用FileWriter因为需要指定编码类型否则生成的Word文档会因为有无法识别的编码而无法打开
            Writer w = new OutputStreamWriter(new FileOutputStream(f), "utf-8");
            t.process(dataMap, w);
            w.close();
        } catch (Exception ex) {
            ex.printStackTrace();
            throw new RuntimeException(ex);
        }
        return f;
    }

}
